This is very similar if not the same issue as in https://www.slimjet.com/en/forum/viewtopic.php?f=6&t=2534. One person said that they had the Banana theme installed and saw a yellow border but I cannot recreate that. The only thing that goes yellow for me is the title bar which is expected. In my ca...

This sounds like the same issue I was going to search for/report when creating an "app" ("Cog wheel" -> "More tools" -> "Create shortcut" and enable "Open as window") out of a web page. It seems all of my "apps" have this black border and it seem to be the same size as the tool bar in the regular Sl...